| Period of George W. Bush's presidency | 41 |
| Period of gradual decline | 25 |
| Period of great glaciation | 26 |
| Period of great growth | 22 |
| Period of great prosperity | 26 |
| Period of greatest success | 26 |
| Period of growth | 16 |
| Period of high artistic development | 35 |
| Period of history | 17 |
| Period of human benightedness | 29 |
| Period of human history that began about 3,000 years ago | 56 |
| Period of ignorance | 19 |
| Period of immaturity | 20 |
| Period of imminent danger | 25 |
| Period of inactivity | 20 |
| Period of increased births | 26 |
| Period of indulgence | 20 |
| Period of instability, perhaps | 30 |
| Period of investor confidence | 29 |
| Period of Lent, e.g. | 20 |
| Period of life | 14 |
| Period of literary style, e.g. | 30 |
| Period of little change | 23 |
| Period of low activity | 22 |
| Period of major fighting | 24 |
| Period of many years | 20 |
| Period of marked improvement? | 29 |
| Period of meaningful interaction | 32 |
| Period of metalwork advances | 28 |
| Period of most activity | 23 |
| Period of mourning in Judaism | 29 |
| Period of note | 14 |
| Period of occupancy | 19 |
| Period of office | 16 |
| Period of one's prime | 25 |
| Period of panic | 15 |
| Period of penitence | 19 |
| Period of play in curling | 25 |
| Period of power | 15 |
| Period of powerlessness | 23 |
| Period of prayer | 16 |
| Period of prayer? | 17 |
| Period of preparation | 21 |
| Period of prosperity | 20 |
| Period of quiescence | 20 |
| Period of quiet | 15 |
| Period of radio silence | 23 |
| Period of rapid growth | 22 |
| Period of rationing (abbr.) | 27 |
| Period of rationing: Abbr. | 26 |
| Period of relaxation | 20 |
| Period of reprieve | 18 |
| Period of rest | 14 |
| Period of rule | 14 |
| Period of sacrifice | 19 |
| Period of self-indulgence | 25 |
| Period of service duty | 22 |
| Period of service, as in the Army | 33 |
| Period of seven days without bathing? | 37 |
| Period of silence | 17 |
| Period of slow development | 26 |
| Period of slow growth | 21 |
| Period of Sputnik and Apollo 11 | 31 |
| Period of stability | 19 |
| Period of success on Broadway | 29 |
| Period of supervision for a porn actor who's done poorly in recent backdoor scenes? | 87 |
| Period of suspended activity | 28 |
| Period of the Cenozoic Era | 26 |
| Period of the Crusades | 22 |
| Period of the first dinosaurs | 29 |
| Period of time | 14 |
| Period of time in Spain | 23 |
| Period of time served | 21 |
| Period of time when bar snacks are discounted? | 46 |
| Period of time, in astronomy | 28 |
| Period of trial | 15 |
| Period of unbridled activity | 28 |
| Period of unrestrained criticism | 32 |
| Period of unrestraint | 21 |
| Period of unrestricted activity | 31 |
| Period of usability, as for canned goods | 40 |
| Period of wakefulness | 21 |
| Period of watchful attention | 28 |
| Period of watchfulness | 22 |
| Period of watching | 18 |
| Period of years | 15 |
| Period of youth | 15 |
| Period off the wagon | 20 |
| Period on a geologic time scale | 31 |
| Period on the throne | 20 |
| Period or comma | 15 |
| Period or stat | 14 |
| Period part | 11 |
| Period piece | 12 |
| Period piece? | 13 |
| Period pieces | 13 |
| Period pieces? | 14 |
| Period postponing the inevitable | 32 |
| Period preceding an expiration date? | 36 |
| Period prior to 1941, in the U.S. | 33 |